OpenOTP Authentication Server

OpenOTP Authentication Server is ranked #8 of 113 in authenticator apps on The Geeks Club, made by OpenOTP Authentication Server (Esch-sur-Alzette, Luxembourg). It runs on Android, API, iOS, Linux, macOS, Self-hosted, Web, Windows. There is a free plan. A free trial is offered.

OpenOTP Authentication Server plans and pricing

All plans

Freeware Edition Not published 25 users · 1 server rcdevs.com · 20 Sept 2026

Enterprise Edition Not published 250 users rcdevs.com · 20 Sept 2026

Cloud Edition Not published 250 users rcdevs.com · 20 Sept 2026

On-Premise Freeware Free under 25 users · all features · one server · no HA · 365 days, renewable rcdevs.com · 30 Sept 2026

SaaS Trial Free 30 days · up to 250 OpenOTP users · 50 SpanKey hosts rcdevs.com · 30 Sept 2026

On-Premise Trial Free all features · 2 active/active servers (HA) · 30 days · up to 10 users rcdevs.com · 30 Sept 2026

Compared on authenticator apps

Free plan: Yes

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OpenOTP Authentication Server

Free plan: Yes
Purpose: OpenOTP is an MFA server with OTP and FIDO2 for securing user network access.
Deployment: OpenOTP is offered for on-premise installation and as a cloud/SaaS service.
Directory integration: The product supports local Active Directory and LDAP directories and lists integrations with Entra ID, DUO, Okta, Google, Ping Identity, and One Identity.
Authentication methods: Listed methods include mobile push, FIDO2/passkeys, YubiKey, OATH tokens, SMS, email, printed OTP lists, and PKI certificate authentication.
Access policies: The feature list includes per-application, per-user and group, risk-based, network and geolocation policies, plus contextual authentication and step-up/step-down policies.
Security features: The feature list includes phishing protection, denial-of-service protection, intelligent geo-fencing, replay attack protection, leaked-password protection, and integrated PKI.
Federation and API: Listed integration features include SAML, OpenID Connect, OAuth2, Kerberos, an ADFS plugin, Windows login plugin, RPC-based management API, and SIEM integration.
VPN and RADIUS: The OpenOTP RADIUS Bridge provides a RADIUS API over OpenOTP web services and supports enterprise VPN appliances and EAP for Wi-Fi or NAC authentication.
Legacy LDAP applications: The optional OpenOTP LDAP Bridge acts as a proxy to provide OTP login mechanisms for existing LDAP users and legacy applications.
Platform plugins: RCDevs lists OpenOTP plugins for Windows login, Linux PAM, macOS PAM and login, ADFS, RDWeb Gateway, SimpleSAMLphp, and Nextcloud.
Notable limits: The feature table marks LDAP Bridge OTP as currently unsupported in the listed editions and says SMS authentication requires SMS credits or an external SMS provider.
Support: The feature table lists SLA and support services as optional, and RCDevs links to product documentation and community forums.
Intended customers: RCDevs says it serves SMEs and large corporations across IT, finance, healthcare, and government sectors.
Price from: Free

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Where it ranks on The Geeks Club

Best Authenticator Apps in 2026#8 of 113

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Sources

rcdevs.com/products/openotp/· checked 20 Sept 2026
rcdevs.com/license-features/· checked 30 Sept 2026
rcdevs.com/downloads/software-packages/· checked 30 Sept 2026
rcdevs.com/downloads/integration-plugins/· checked 30 Sept 2026
rcdevs.com/about-us/· checked 30 Sept 2026
rcdevs.com/license-features· checked 20 Sept 2026
rcdevs.com/try-and-buy/· checked 30 Sept 2026
shop.rcdevs.com· checked 30 Sept 2026